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Linux and UNIX Man Pages

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Linux 2.6 - man page for if_nametoindex (linux section 3)

IF_NAMETOINDEX(3)					     Linux Programmer's Manual						 IF_NAMETOINDEX(3)

NAME
if_nametoindex, if_indextoname - mappings between network interface names and indexes
SYNOPSIS
#include <net/if.h> unsigned int if_nametoindex(const char *ifname); char *if_indextoname(unsigned int ifindex, char *ifname);
DESCRIPTION
The if_nametoindex() function returns the index of the network interface corresponding to the name ifname. The if_indextoname() function returns the name of the network interface corresponding to the interface index ifindex. The name is placed in the buffer pointed to by ifname. The buffer must allow for the storage of at least IF_NAMESIZE bytes.
RETURN VALUE
On success, if_nametoindex() returns the index number of the network interface; on error, 0 is returned and errno is set appropriately. On success, if_indextoname() returns ifname; on error, NULL is returned and errno is set appropriately.
ERRORS
if_nametoindex() may fail and set errno if: ENODEV No interface found with given name. if_indextoname() may fail and set errno if: ENXIO No interface found for the index. if_nametoindex() and if_indextoname() may also fail for any of the errors specified for socket(2) or ioctl(2).
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7). +-----------------------------------+---------------+---------+ |Interface | Attribute | Value | +-----------------------------------+---------------+---------+ |if_nametoindex(), if_indextoname() | Thread safety | MT-Safe | +-----------------------------------+---------------+---------+
CONFORMING TO
POSIX.1-2001, POSIX.1-2008, RFC 3493. This function first appeared in BSDi.
SEE ALSO
getifaddrs(3), if_nameindex(3), ifconfig(8)
GNU
2017-09-15 IF_NAMETOINDEX(3)

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